Proton Synchrotron Radiation at Fermilab

While protons are not generally associated with synchrotron radiation, they do emit visible light at high enough energies. This paper presents an overview of the use of synchrotron radiation in the Tevatron to measure transverse emittances and to monitor the amount of beam in the abort gap. The latter is necessary to ensure a clean abort and prevent quenches of the superconducting magnets and damage to the silicon detectors of the collider experiments

The Origination and Diagnostics of Uncaptured Beam in the Tevatron and Its Control by Electron Lenses

In the Collider Run II, the Tevatron operates with 36 high intensity bunches of 980 GeV protons and antiprotons. Particles not captured by the Tevatron RF system pose a threat to quench the superconducting magnet during acceleration or at beam abort. We describe the main mechanisms for the origination of this uncaptured beam, and present measurements of its main parameters by means of a newly developed diagnostics system. The Tevatron Electron Lens is effectively used in the Collider Run II operation to remove uncaptured beam and keep its intensity in the abort gaps at a safe level.Comment: 36 pp, 15 Figs, submitted for publicati5on in Phys. Rev. Special Topics Accel. Beam

Bunch length measurement at the Fermilab A0 photoinjector using a Martin-Puplett interferometer

We present preliminary measurements of the electron bunch lengths at the Fermilab A0 Photoinjector using a Martin-Puplett interferometer on loan from DESY. The photoinjector provides a relatively wide range of bunch lengths through laser pulse width adjustment and compression of the beam using a magnetic chicane. We present comparisons of data with simulations that account for diffraction distortions in the signal and discuss future plans for improving the measurement

The Measurement of the Mass of the W Boson from the Tevatron

. This paper presents measurements of the mass of the W vector boson from the CDF and DØ experiments using data collected at p s = 1:8 TeV during the 19941995 data taking run. CDF finds a preliminary mass of MW = 80:43 \Sigma 0:16 GeV and DØ measures a mass of MW = 80:44 \Sigma 0:12 GeV. I INTRODUCTION During the 1994-1995 collider run of the Fermilab Tevatron, the CDF and DØ experiments collected data corresponding to integrated luminosities of 90 pb \Gamma1 and 82 pb \Gamma1 respectively. From this data, CDF extracted ¸ 21,000 W ! ¯ events while DØ obtained ¸ 28,000 W ! e events. These W events were used to make measurements 2 of the mass of the W boson [1]. A Motivation When going from tree level in the Standard Model (SM) to next-to-leading order, the relation between the mass of the W boson and the other SM parameters gets modified as follows: MW 2 = / ßff EM (0) p 2G F sin 2 ` W ! \Gamma! / ßff EM (M Z 2 ) p 2G F sin 2 ` W ! 1 1 \Gamma \Deltar ; (1..

The measurement of the mass of the W boson from the Tevatron

This paper presents measurements of the mass of the W vector boson from the CDF and D0 experiments using data collected at {radical}s = 1.8 TeV during the 1994-1995 data taking run. CDF finds a preliminary mass of M{sub W} = 80.43 {+-} 0.16 GeV and D0 measures a mass of M{sub W} = 80.44 {+-} 0.12 GeV

Gated Microchannel Plate Photomultiplier For Longitudinal Beam Diagnostics

A gated microchannel plate photomultiplier can be used as an effective tool for measuring the longitudinal distribution of particles around most electron and high-energy proton rings. The broad available wavelength range, low noise, and high sensitivity allow using such a device for measuring the emitted synchrotron radiation and to extract the beam intensity. The fast gate rise time can be used to reject strong signals coming from filled RF buckets and avoid saturation of the photocathode so that it is possible to monitor, with a high degree of resolution, gaps in the machine fill and growth of parasitic bunches. The rugged characteristics of the device and its simplicity of use make it ideal for all those applications where more complex and expensive instrumentation is not absolutely necessary. We present the experimental results obtained at the Advanced Light Source and on the Tevatron using an Hamamatsu R5916U-50 series model